v3.26.1
Income Taxes - Income Tax (Benefit) Provision from Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Income before income taxes:      
U.S. $ (33.8) $ (131.5) $ 555.5
Foreign 307.3 170.4 1,810.4
Income before income taxes 273.5 38.9 2,365.9
Current provision:      
U.S. federal 51.7 127.5 347.5
State 3.5 0.0 20.0
Foreign 52.9 55.2 118.7
Total current provision 108.1 182.7 486.2
Deferred provision (benefit):      
U.S. federal (21.6) (101.0) (106.4)
State (2.2) (5.5) (12.3)
Foreign (40.8) (36.8) 91.5
Total deferred provision (benefit) (64.6) (143.3) (27.2)
Income tax provision 43.5 39.4 459.0
Amount      
U.S. federal statutory income tax rate 57.4 8.2 496.8
Domestic state and local income taxes, net of federal effect (1.8) (2.1) 15.7
Research and development credits (24.5) (60.1) (69.8)
GILTI 43.0    
Foreign income tax credits (16.5)    
Other (2.6)    
Other 8.4 13.4 2.6
Statutory income tax rate differential   (19.2) (149.3)
Income tax holidays   (12.0) (22.5)
Change in uncertain tax positions 4.7 45.1 5.8
Effective tax rate $ 43.5 $ 39.4 $ 459.0
Percent      
U.S. federal statutory income tax rate 21.00%    
Domestic state and local income taxes, net of federal effect (0.70%)    
Research and development credits (9.00%)    
GILTI 15.70%    
Foreign income tax credits (6.00%)    
Other (0.90%)    
Other 3.10%    
Change in uncertain tax positions 1.70%    
Effective tax rate 15.90%    
Malta      
Amount      
Other $ (3.2)    
Statutory income tax rate differential 36.7    
Notional interest deduction $ (83.0)    
Percent      
Other (1.20%)    
Statutory income tax rate differential 13.40%    
Notional interest deduction (30.30%)    
Canada      
Amount      
Research and development credits $ (13.4)    
Other 9.2    
Imputed interest income $ 6.8    
Percent      
Research and development credits (4.90%)    
Other 3.40%    
Imputed interest income 2.50%    
Ireland      
Amount      
Other $ 0.9    
Statutory income tax rate differential 11.0    
Withholding and other taxes $ 7.7    
Percent      
Other 0.30%    
Statutory income tax rate differential 4.00%    
Withholding and other taxes 2.80%    
Thailand      
Amount      
Other $ 1.1    
Nontaxable and nondeductible Items (8.8)    
Income tax holidays $ (5.1)    
Percent      
Other 0.40%    
Nontaxable and nondeductible Items (3.20%)    
Income tax holidays (1.90%)    
Taiwan      
Amount      
Other $ 0.1    
Withholding and other taxes $ 9.4    
Percent      
Other 0.00%    
Withholding and other taxes 3.50%    
Other foreign jurisdictions      
Amount      
Other $ 6.0    
Percent      
Other 2.20%